What is the primary indication for naltrexone's injectable form?

Naltrexone's injectable form is primarily indicated for the treatment of alcohol dependence. This medication works as an opioid receptor antagonist, which means it blocks the effects of opioids in the brain. In the context of alcohol dependence, naltrexone helps reduce cravings for alcohol, decreases the pleasure associated with drinking, and ultimately supports individuals in their recovery efforts. Clinical studies have demonstrated its effectiveness in helping patients remain abstinent and decrease heavy drinking days.

The other options, such as major depressive disorder, generalized anxiety disorder, and psychosis, are not the primary indications for naltrexone. While certain medications may be used in the management of those conditions, naltrexone is not one of them. Its use in other mental health disorders is not established like it is with alcohol dependence. Thus, its injectable form is specifically designed to support treatment in individuals struggling with alcohol use disorder.